3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Fernando Luis Vázquez Cao <fernando_b1@xxxxxxxxxxxxx>
commit 99d249021abd4341771523ed8dd7946276103432 upstream.
Document what the fix-up is does and make it more robust by ensuring
that it is only applied to the USB interface that corresponds to the
mouse (sony_report_fixup() is called once per interface during probing).
Signed-off-by: Fernando Luis Vazquez Cao <fernando@xxxxxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/hid-sony.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -43,9 +43,19 @@ static __u8 *sony_report_fixup(struct hi
{
struct sony_sc *sc = hid_get_drvdata(hdev);
- if ((sc->quirks & VAIO_RDESC_CONSTANT) &&
- *rsize >= 56 && rdesc[54] == 0x81 && rdesc[55] == 0x07) {
+ /*
+ * Some Sony RF receivers wrongly declare the mouse pointer as a
+ * a constant non-data variable.
+ */
+ if ((sc->quirks & VAIO_RDESC_CONSTANT) && *rsize >= 56 &&
+ /* usage page: generic desktop controls */
+ /* rdesc[0] == 0x05 && rdesc[1] == 0x01 && */
+ /* usage: mouse */
+ rdesc[2] == 0x09 && rdesc[3] == 0x02 &&
+ /* input (usage page for x,y axes): constant, variable, relative */
+ rdesc[54] == 0x81 && rdesc[55] == 0x07) {
hid_info(hdev, "Fixing up Sony RF Receiver report descriptor\n");
+ /* input: data, variable, relative */
rdesc[55] = 0x06;
}
--
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